Linebacker
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Linebacker (LB) is a playing position in gridiron football. Linebackers are members of the defensive team, and line up three to five yards behind the line of scrimmage and the defensive linemen. They are the "middle ground" of defenders, playing closer to the line of scrimmage than the defensive backs (secondary), but farther back than the defensive linemen.
In white jerseys, Lance Briggs (#55) and Brian Urlacher (#54) of the Chicago Bears, are positioned as linebackers on Lambeau Field in 2011.
The University of Michigan is credited with creating the linebacker position, which was first played by Germany Schulz
Chuck Bednarik of the Philadelphia Eagles, a first round draft selection in the 1949 NFL Draft and member of the Pro Football Hall of Fame, is considered one of the hardest hitting and best linebackers in NFL history; his November 20, 1960 tackle of Frank Gifford, a New York Giants running back, is known simply as "The Hit" and is considered one of the hardest hits in the league's history.
Lineman (gridiron football)
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In gridiron football, a lineman is a player who specializes in play at the line of scrimmage. The linemen of the team currently in possession of the ball are the offensive line, while linemen on the opposing team are the defensive line. A number of NFL rules specifically address restrictions and requirements for the offensive line, whose job is to help protect the quarterback from getting sacked for a loss, or worse, fumbling. The defensive line is covered by the same rules that apply to all defensive players. Linemen are usually the largest players on the field in both height and weight, since their positions usually require less running and more strength than skill positions.
The Green Bay Packers offensive line
The Pittsburgh Steelers offensive line
The Montreal Alouettes offensive line (left) and the Calgary Stampeders defensive line (right)